package com.example.concurrency.example.count;

import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author verlet
 * @date 2018/7/16
 */
@Slf4j
public class TestConcurrency {

    /**
     * 请求总数
     */
    public static int clientTotal = 1000;

    /**
     * 同时并发执行的线程数
     */
    public static int threadTotal = 50;

    private static AtomicInteger atomicCount = new AtomicInteger(0);

    public static void main(String[] args) throws InterruptedException {
        ExecutorService executorService = Executors.newCachedThreadPool();
        final Semaphore semaphore = new Semaphore(threadTotal);
        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);
        for (int i = 0; i < clientTotal; i++) {
            executorService.execute(() -> {
                try {
                    semaphore.acquire();
                    add();
                    semaphore.release();
                } catch (Exception e) {
                    log.error("exception", e);
                }
                countDownLatch.countDown();
            });

        }
        countDownLatch.await();
        executorService.shutdown();
        log.info("count:{}",atomicCount.get());
    }

    private static void add() {
        atomicCount.incrementAndGet();
    }
}
